Eraser



Patented Sept. 2, 1941 4 UNITED STATES PATENT OFFICE ERASER Rudolph George Roesch, Syracuse, N. Y., assignor to The Eraser Company, Inc., Syracuse, N. Y., a corporation of New York Application August 3, 1940, Serial No. 350,766-

'I Claims.

vide a simple, inexpensive eraser holder constructed of a plurality of parts rotatably joined together.

Another object of my invention is to provide a hollow eraser case having a substantially cylindrical cavity therein for holding the eraser, said cavity being provided with integral guides for directing and supporting throughout its length a relatively long, substantially at eraser.

Still another-object oi my invention is to provide a simple inexpensive separable lconnection eraser.

A still further object of my invention is to provide a simple bent wire connector forA releasably joining a substantially flat eraser to the propelling mechanism.

Other objects and advantages of my invention will appear from the following specification taken in commotion with the accompanying drawing, in which:

Figure 1 is a perspective view of an eraser holder embodying the various features of this invention.

Figure 2 is an enlargedlongtudinal central sectional view of the same.

Figure 3 is a perspective view illustrating various parts of the eraser shown in Figures 1 and 2 with the parts arranged in exploded relation to each other, certain of the parts being shown broken away and in section.

Figure 4 is a transverse sectional view takenA on the line 4-4 of Figure 2.

Figure 5 is a transverse sectional view taken on the line 5-5 of Figure 2.

Figure 6 is a transverse sectional View taken.

on the line 6-6 of Figure 2.

Figure 7 is a perspective view of a long, at eraser adapted for use in my eraser holder and showing a simple wire connector for joining the eraser to the propelling mechanism. l

Figure 8 is a plan view of the forming dies used in formingdup the wire connector shown in Figure 7.

Figure 9 is an elevation, part being in section and part being broken away, illustrating the 55 other. After the sleeve 25 is placed on to the (Cl. 12o-36) forming of a wire connector by means of the dies illustrated in Figure 8.

Figure is an elevation, part being in section, taken on the line IIl--IIJ of Figure 9.

5 ,Figure 11 is a plan view, part being broken away, of an eraser with the wire connector in place.

The eraser illustrated in Figures 1 to 6, inclusive, comprises primarily a tubular case or holder 10 I2, an erasing element or reilll I3, and suitable operating means comprising a screw I4 coacting with the erasing element for moving the same with respect to said case.

The c'ase or holder I`2, in this instance, is

15 composed of three sections, an eraser housing section I5, a propeller barrel I6 and an intermediate section or-ferrule I'I. The eraser housing I5 and barrel I6 are preferably composed of light molded material such as Bakelite, while the ferrule I'I is preferably composed of metal b etween theA propelling mechanism and the such as nickel plated brassA or other suitable material. The ferrule I'I is constructed with a tubular or socket portion I8 of substantially the same outer diameter as the end portions I5 and I6 and a hub or boss portion I9 of less diameter than the socket I8 and which is arranged to ex' tend from one end of the socket I8 in substantially coaxial relation therewith.

The socket I8 ofthe ferrule Il is provided with internal threads 20 which are adapted to engage corresponding external threads 2l `provided on the reduced inner end portion 22 of the eraser housing I5 for releasably securing the ferrule and housing I5 to each other. The hub portion I9 is provided with a circumferential groove 23 adjacent the outer endthereof. The inner wall of the groove 23 may be radial or at right angles to the axis of the hub I9. VThe outer wall 24 of the groove 23 is disposed at an angle to the axis of the hub I9 so as to provide a substantially V-shaped form to the groove 23.

A hollow sleeve 25 is rotatablymounted on the hub I'9. The width of the sleeve 25 is slightly greater than the length of the hub I9 as measured from the portion I8 to the inner vertical wall of the groove 23. In other words, the outer edge of the sleeve 25 projects part way over the groove 23 when the sleeve 25 is mounted so as to abut against the socket I3 of the ferrule I1.

The sleeve 25 is secured on the hub I 9 by means of the C-shaped clip 26.- The clip 26, best illustrated in Figures 3 and 5, is shaped substantially in the form of an open sided square with the ends 21 bent slightly inward toward each hub I the clip 25 is slipped into the groove 23, the inward bend given to the end portions 21 being sunlcient to frictionally retain the clip 25 in the groove 23. 'I'he outer surface of the sleeve 25 is provided with longitudinal substantially parallel ridges or corrugations 23 for a purpose presently to be described.

The ferrule I1 is provided with a substantially axially internally threaded bore to .accommodate the screw member I4. One end of the screw member I4 is provided with a pair of diametrically opposed ears 30 which, in the preferred form, are formed integrally with the screw member I4. The opposite end of the screw member I4 is provided with a head 3| joined to the screw member by a neck portion 32, the head 3| and neck 32 being preferably integral with the screw member I4. After threading the screw member I4 in the ferrule I1, it is staked as at 33 to prevent unscrewing beyond a predetermined point for a purpose presently to be described.

The propeller barrel I5 is provided with a cylindrical bore35, as illustrated in Figures 3 and 6. The diameter of the bore 35 is slightly greater than that of the screw member I4 so that the sleeve 25.

member I4 may slide freely therein. Extending outwardly from the cylindrical bore 35 are the diametrically opposed longitudinal grooves 35. The grooves 35 are designed to slidably accommodate the ears of the screw member I4 so that rotation of the barrel I5 will rotate the screw I4. 'I'he inner end of the barrel I5 is provided with an enlarged cylindrical bore 31 of a diameter sunlciently smaller than the outside diameter of the sleeve 25 to permit the barrel I5 to be press-ntted on the sleeve 25. It is to be noted that the clip 25 is proportioned so that it just nts inside the cylindrical bore of the barrel I5 so that after said barrel is pressed in place on the sleeve 25, the clip 25 is permanently locked in the groove 23 as shownin Figure 5. It is thus obvious that the barrel I5 is rotatably joinedto the ferrule I1 by means of thesleeve 25 which is securely held in place by the clip 25 in such fashion that there is no wobble or shake between the ferrule I 1 and the barrel I5.

The eraser housing I5 of the case is flattened. as at 45, adjacent the outer end thereof and that end is provided with an oblong aperture 4I which opens into the interior cylindrical bore 42. As illustrated in Figures 2 and 4, a pair ofdiametprovided with an end cap 5I. The cap 5I is secured to the bundle of glass nbresl by inrically opposed grooves 43 are provided extending asc-1,874'

vided in the end plate of the extension 53 to accommodate the neck 32 of the screw member I4.

To insert the nbre glass eraser in the holder, the eraser housing I5 is unscrewed from the ferrule I1, the nbre glass eraser is partially inserted in the bore 42 of the housing I5 with the cap 5I projecting outward from the housing I 5 so that the head 3| of the screw member I4- may be inserted into the opening 54 of the projection 53. The housing I5 is then screwed into the ferrule I1. 'I'he nbre glass eraser 55 may be propelled outward so as to project beyond the end slot.4i by holding the ferrule I1 and rotating the barrel I5 in a clockwise direction. The nbre glass eraser may be drawn back into the housing I5 by holding the ferrule I1 and rotating the barrel I5 in the counterclockwise direction. As has been noted above, the screw member I4 is staked as at 33 to prevent turning the screw member I4 out far enough the bore 35 and to strike the inner end of force the barrel I5 on the My eraser holder is likewise adapted to acnber glass eraser described above. ForI this purpose, I prefer to use a lustrated in Figure 7 which, in the preferred form, is made of a composition of rubber and glass although an ordinary'rubber composition can be used. The eraser 50 is preferably proportioned so that it will nt 43 contained within the portion I5. The grooves 43 thus support the eraser 50 throughout its length, thereby preventing buckling of the eraser when it is propelled outwardly. The length of the eraser 53 may be substantially the length of the housing I5 so that when it is assembled, it will project a slight distance beyond the slot 4I, as illustrated in Figure l.

I have provided a novel and inexpensive connector 5I for joining the rubber eraser 53 with I he screw member I4. The connector 5| is formed of a U-shaped wire staple similar to the staples used in ofiice stapling machines for permanently fastening papers together. However, by the use of the dies illustrated in Figure 8. I bend the staple so as to form a hook 52 which is adapted to reach around the head 3| and grasp the neck 32 of the screw member I4. 'I'he other end of the staple is driven through the eraser 55 and bent around, as at 53, Figure 9, to permanently fasten the connector 5I to the eraser 55. In order that the head 3i of the screw member serting the bundle 55 into the cylindrical portion l 52 and then crimping the end .thereof as illustrated. The cap 5I comprises a hollow substantially cylindrical body portion 52 which is provided with a smaller substantially cylindrical extension 53. The side wall of the extension 53 is provided with an opening 54 which is large enough to accommodate the head 3I of the screw member I4. A radially extending slot 55 is proend of -the eraser 55, I prefer to insert the member 5I and fasten it at anangle, as shown in Figure 11. This positioning may be obtained by means of a guide 15 positioned adjacent the die 1I, as shown in Figure 8. The die 12 is slightly higher than the die 1'I- so that the shoulder 13 provides a stop for positioning the end of the eraser 55 with relation to the forming parts 14 and 15 oi the dies 1I and 12, as illustrated in Figures 8 and 9. thereby controlling the distance of'the hook 52 from the end of the eraser 5l. The shoulder 13 is formed by cutting away a portion of the die 12 projecting above the die 1I at an angle such that the shoulder 13 is perpendicular to the guide 1 The U-shaped staple may be driven against the forming dies 1I and 12 by any conventional staple Inusinganerasersimilarinshapetothe rubber eraser 55 as ilsnugly in the grooves- 'aperture for substantially eraser 60described above wherein said eraser is provided with a connector similar to the connector 6I, the eraser housing I5 is unscrewed from the ferrule I1, the eraser 60 is inserted in the guide slots 43 in the housing l5, the head 3| of the screw member I4 is engaged by means of a connector 6I and then the housing l5 is screwed into the ferrule I1. The eraser 60 may then be propelled outward from or withdrawn into the housing l in a manner similar to that described for the use of the bre glass eraser.

Although I have described a speciic embodiment of my invention, it is obvious that changes in form and proportion of the parts may be made by those skilled in the art and I therefore wish to be limited only by the scope of the appended claims.

I claim: 1. A propel-retract eraser holder comprising 'an eraser housing provided with an axial bore for housing an eraser, an intermediate ferrule portion, means for releasably joining said ferrule to said eraser housing, a propelling member screw-threaded in said ferrule and projecting axially a substantial distance each side of said ferrule, a cylindrical boss projecting axially from said ferrule. a rotatable collar mounted on said boss, means for 'retaining said collar on said boss, a propeller barrel permanently attached to said collar, and cooperating means carried by said barrel and said screw for turning said screw as said barrel is rotated.

2. An eraser holder as described in claim 1 wherein said collar retaining means comprises an annular groove in the circumference o! said boss located adjacent the outer end thereof and partially under 'said collar, said groove being formed with an inwardly slanting outer wall. and a substantially square spring clip having one open side adapted to ilt intosaid groove, whereby said groove and said clip cooperate to retain said collar on said boss and resiliently urge said collar inwardly.

3. In a propel-retract,eraserL/holdervhaving-Yam` pluralityl fof relatively rotatable longitudinal portions, propelling means contained within said holder, and means for actuating said propelling means by rotating one of saidlongitudinal portions relative to the second portionin combi nation, an eraser housing portion Yreleasably joined to said secondA portion, an axial bore extending throughout said eraser housing portion/ and terminating at its outer end in an oblong aperture, and a pair oi internal guides comprising two oppositely disposed grooves extending from the ends o! said oblong the length oisaid axialbore. l

4. A case member for a relllable eraser holder adapted for accommodating either a glass nbre eraser comprising a substantially cylindrical bundle of glass libresA or a substantially at, thin rubber eraser, said case member having a substantially cylindrical bore terminating at its outer end in an oblong aperture, and a pair oi internal longitudinal guides comprising two oppositely disposed internal grooves extending from the ends of said oblong aperture for substantially the length of said bore, said grooves being adapted to receive and support said at rubber eraser throughout its length.

- 5. In a propel-retract eraser holder comprising a substantially tubular case having an opening at the end thereof to allow the passage of an eraser therethrough, a second tubular member, means for rotatably Joining said tubular members together, and a propelling screw operatively connected with said second member to rotate therewith for advancing and retracting said screw, in combination, a connector element located at the eraser end of said screw comprising an axially disposed neck and a circular head joined to said neck, a socket adapted rotatably to receive said head, said socket comprising a cylindrical cap having an axial aperture to aocommodate said neck and a lateral T-shaped slot to allow the passage of said head and neck sidew'lse into said cap, and means for attaching said cap to said eraser.

6. In a propel-retract eraser holder having a substantially tubular case for containing an eraser element and screw means for feeding said eraser in and out of said case, in combination, means for connecting said eraser element to said screw comprising 'a head, a neck joining said vhead to any end of said screw, and a wire connector fastened to the end of said eraser element,

`said wiregconnctor comprising a transverse U- shaped portion adapted to embrace said'neck and prevent axial escape oi said head, a stem portion extending substantially parallel to the of said head, and a staple portion extending at right angles to said stem portion, said staple portion being clinched to said eraser element.

'1. A wire connector for releasably joining an erasing element to the propelling mechanism oi `an eraser holder, comprising Aa transverse U- internal longitudinal u element.

shaped portion adapted to engage said propelling mechanism. a stem portion extending longitudinally of said erasing element, and, a staple portion extending at right angles to said stem portion and adapted t0 be clinched to said erasing RUDOLPH GBDRGE HOESCH. 

